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Full Tank - Gas Smell

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Full Tank - Gas Smell

Post by njusko » Thu Nov 21, 2019 10:16 am

So, I have a bit of a strange situation with my wife's T-Rex.

When we go to fill up the tank, after letting the car sit for a few minutes the interior has a pretty strong gas smell.

This goes away after driving the car for a while, generally, once it gets past the top of the full line (down about 1/8 tank or so), then it never comes back unless we fill up the tank.

Also, I've experimented a few times and noticed that if we don't fill it up all the way (stop just shy of the pump automatically clicking off), then this doesn't happen. This has been our band-aid fix for the time being.

I've taken it to two mechanics when this has happened and they reviewed the fuel system (smoke/pressure test) and didn't find any leaks, there's also no CEL codes being thrown (no deep codes either). I've also replaced the gas cap to no avail.

My suspicion is that the fuel pump gasket has a slight leak in it that's allowing for vapors to be released into the cabin through the access panels when the tank is full. Has anyone ever come across an issue like this before?

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Re: Full Tank - Gas Smell

Post by spy1309 » Sat Nov 23, 2019 12:23 pm

Did you check the gas cap? It has a small pressure vent hole , try to get a new gas cap or one from a junk yard

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Re: Full Tank - Gas Smell

Post by dwighte » Sat Nov 30, 2019 10:27 am

Not getting any codes maybe your drive conditions. The temperature has to be around 70+- some. You need to start the car cold of at least 8 hours, not running. The tank needs to be 1/4 to 3/4 full. You need to drive at slow hiway speed of about 45 to 55, continuously for about 5 to ten minutes.
Driving around town with stop lights and such and the car won't run the evap test. Even if it runs the test, there are things that can fail that may not be caught by the test. Often the rollover valve is not fully tested. I suspect other things as well might be missed. A good check to see if things are at least testing is to loosen the gas cap. If it is running the test it should fail.
It might not be an issue with the test. If you spill a little bit of gas around the filler neck it can smell up the car.

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